CVE-2024-26980: ksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf

Severity: high (CVSS 8.2 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-01 · updated 2026-08-04
Weakness: CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix slab-out-of-bounds in smb2_allocate_rsp_buf If ->ProtocolId is SMB2_TRANSFORM_PROTO_NUM, smb2 request size validation could be skipped. if request size is smaller than sizeof(struct smb2_query_info_req), slab-out-of-bounds read can happen in smb2_allocate_rsp_buf(). This patch allocate response buffer after decrypting transform request. smb3_decrypt_req() will validate transform request size and avoid slab-out-of-bound in smb2_allocate_rsp_buf().

Affected products

Linux kernel: from 5.15 before 5.15.159; from 5.16 before 6.1.88; from 6.2 before 6.6.29; from 6.7 before 6.8.8; 6.9-rc1, 6.9-rc2, 6.9-rc3, 6.9-rc4, 6.9-rc5 — fixed in 5.15.159, 6.1.88, 6.6.29, 6.8.8

How to fix

Upgrade to a fixed version: Linux kernel 5.15.159, 6.1.88, 6.6.29, 6.8.8. Check the vendor advisory for mitigations.

References

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